29,999 results match your criteria Organic Solvents


Morphology-Dependent Luminescence in Complex Liquid Colloids.

J Am Chem Soc 2019 Feb 20. Epub 2019 Feb 20.

Department of Chemistry and Institute for Soldier Nanotechnologies , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States.

Complex liquid colloids hold great promise as transducers in sensing applications as a result of their tunable morphology and intrinsic optical properties. Herein, we introduce meta-amino substituted green fluorescence protein chromophore (GFPc) surfactants that localize at the organic-water interface of complex multiphase liquid colloids. The meta-amino GFPc exhibits hydrogen-bonding (HB) mediated fluorescence quenching, and are nearly nonemissive in the presence of protic solvents. Read More

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http://dx.doi.org/10.1021/jacs.8b13215DOI Listing
February 2019

Novel dye for detection of callus embryo by confocal laser scanning fluorescence microscopy.

Luminescence 2019 Feb 19. Epub 2019 Feb 19.

Department of Biotechnology, Daugavpils University, Institute of Life Sciences and Technology, Daugavpils, Latvia.

In the present study a new luminescent dye 3-N-(2-pyrrolidinylacetamido)benzanthrone (AZR) was synthesized. Spectroscopic measurements of the novel benzanthrone 3-aminoderivative were performed in seven organic solvents showing strong fluorescence. The capability of the prepared dye for visualization has been tested on flax, red clover and alfalfa to determinate the embryo in plant callus tissue cultures. Read More

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http://dx.doi.org/10.1002/bio.3616DOI Listing
February 2019

Water-born zirconium-based metal organic frameworks as green and effective catalysts for catalytic transfer hydrogenation of levulinic acid to γ-valerolactone: Critical roles of modulators.

J Colloid Interface Sci 2019 Feb 11;543:52-63. Epub 2019 Feb 11.

Department of Environmental Engineering, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan; Research Center of Sustainable Energy and Nanotechnology, and Innovation, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan; Development Center of Sustainable Agriculture, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan. Electronic address:

While zirconium (Zr)-based metal organic frameworks (MOFs) are promising for conversion of levulinic acid (LA) to γ-valerolactone (GVL) through catalytic transform hydrogenation (CTH), these reported Zr MOFs for LA conversion must be synthesized in toxic dimethylformamide (DMF). From the viewpoint of sustainability, it is preferable to avoid usage of DMF-based solvents to prepare these Zr MOFs. As water is a green solvent, the aim of this study is to develop and investigate Zr MOFs, which are prepared in water, for LA conversion to GVL. Read More

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http://dx.doi.org/10.1016/j.jcis.2019.02.036DOI Listing
February 2019

Asymmetric Wide-Bandgap Polymers Simultaneously Improve the Open-Circuit Voltage and Short-Circuit Current for Organic Photovoltaics.

Macromol Rapid Commun 2019 Feb 19:e1800906. Epub 2019 Feb 19.

Beijing National Laboratory for Molecular Science, CAS State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry Chinese Academy of Science, Beijing, 100190, P. R. China.

A trade-off between open-circuit voltage (V ) and high short-circuit (J ) becomes one of the most vital problems limiting further improvement in polymer solar cells' (PSCs) efficiency. In this work, two asymmetric polymer donors PBDT-F-2TC and PBDT-SF-2TC are designed and synthesized. When blended with a state-of-the-art acceptor IT-4F with low lowest-unoccupied molecular orbital level, simultaneously high V (up to 0. Read More

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http://dx.doi.org/10.1002/marc.201800906DOI Listing
February 2019

Non-Targeted Analysis of a Non-Aqueous Phase Liquid From A Chemical Manufacturing Site Using NMR Spectroscopy.

Environ Toxicol Chem 2019 Feb 19. Epub 2019 Feb 19.

School of Environmental Sciences, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.

Non-aqueous phase liquids (NAPLs), composed primarily of organic solvents and other immiscible liquids, can be found in the subsurface at many industrial sites. The chemical composition of NAPL is often complex and, in many instances, difficult to fully characterize using conventional analytical techniques based on targeted compound analysis. Incomplete characterization of NAPL leaves gaps in the understanding of the chemical profile at an impacted site. Read More

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http://dx.doi.org/10.1002/etc.4394DOI Listing
February 2019

Enantioselective resolution of side-chain modified gem-difluorinated alcohols catalysed by Candida antarctica lipase B and monitored by capillary electrophoresis.

Bioorg Med Chem 2019 Feb 13. Epub 2019 Feb 13.

Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo n. 542/2, 166 10 Prague 6, Czech Republic. Electronic address:

An enzymatic alternative to the chemical synthesis of chiral gem-difluorinated alcohols has been developed. The method is highly effective and stereoselective, feasible at laboratory temperature, avoiding the use of toxic heavy metal catalysts which is an important benefit in medicinal chemistry including the synthesis of drugs and drug precursors. Candida antarctica lipases A and B were applied for the enantioselective resolution of side-chain modified gem-difluorinated alcohols, (R)- and (S)-3-benzyloxy-1,1-difluoropropan-2-ols (1a and 1b), compounds serving as chiral building blocks in the synthesis of various bioactive molecules bearing a gem-difluorinated grouping. Read More

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http://dx.doi.org/10.1016/j.bmc.2019.02.022DOI Listing
February 2019

A highly soluble, crystalline covalent organic framework compatible with device implementation.

Chem Sci 2019 Jan 23;10(4):1023-1028. Epub 2018 Oct 23.

State Key Laboratory of Luminescent Materials and Devices , Institute of Polymer Optoelectronic Materials and Devices , South China University of Technology , Guangzhou 510640 , P. R. China . Email: ; Email:

Covalent organic frameworks (COFs) have emerged as a tailor-made platform for designing next-generation two-dimensional materials. However, COFs are produced as insoluble and unprocessable solids, which precludes the preparation of thin films for optoelectronic applications. Here, we report designed synthesis of a highly soluble yet crystalline COF material through the regulation of its inter-layer interactions. Read More

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http://xlink.rsc.org/?DOI=C8SC04255A
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http://dx.doi.org/10.1039/c8sc04255aDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6346726PMC
January 2019
3 Reads
9.211 Impact Factor

Delamination-Free Multifunctional Separator for Long-Term Stability of Lithium-Ion Batteries.

Small 2019 Feb 18:e1804980. Epub 2019 Feb 18.

Department of Materials Science and Chemical Engineering, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi, 15588, Korea.

Next-generation lithium-ion batteries (LIBs) that satisfy the requirements for an electric vehicle energy source should demonstrate high reliability and safety for long-term high-energy-density operation. This inevitably calls for a novel approach to advance major components such as the separator. Herein, a separator is designed and fabricated via application of multilayer functional coating on both sides of a polyethylene separator. Read More

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http://doi.wiley.com/10.1002/smll.201804980
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http://dx.doi.org/10.1002/smll.201804980DOI Listing
February 2019
2 Reads

Macromolecular inversion-driven polymer insertion into model lipid bilayer membranes.

J Colloid Interface Sci 2019 Jan 30;542:483-494. Epub 2019 Jan 30.

School of Chemical Sciences, Dublin City University, Dublin 9, Ireland. Electronic address:

Macromolecules of amphiphilic invertible polymers (AIPs) are capable of self-assembly into micellar assemblies of various morphologies in solvents of different polarities. The micellar assemblies in aqueous media are capable of encapsulating poorly aqueous soluble cargo and can undergo inverse conformational change and cargo release in contact with non-polar media, including potentially, cell membranes. Thus, invertible micellar assemblies have significant potential in drug delivery and related domains. Read More

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http://dx.doi.org/10.1016/j.jcis.2019.01.093DOI Listing
January 2019

Simultaneous extraction of 32 polychlorinated biphenyls by using magnetic carbon nanocomposite based dispersive microextraction, subsequent dispersive liquid-liquid microextraction with two miscible stripping solvents, and quantitation by GC-μECD.

Mikrochim Acta 2019 Feb 15;186(3):178. Epub 2019 Feb 15.

Iranian Institute of R&D in Chemical Industries(IRDCI) (ACECR), P. O. Box 313751575, Tehran, Iran.

A highly sensitive new method is described for performing dispersive microextractions. It is making use of a magnetic carbon nanocomposite and two miscible organic solvents. The method was applied to simultaneous extraction of 32 polychlorinated biphenyls (PCBs) prior to their quantitation by gas chromatography with electron capture detection. Read More

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http://dx.doi.org/10.1007/s00604-019-3235-xDOI Listing
February 2019
3.741 Impact Factor

Photophysical features and semiconducting properties of propeller-shaped oligo(styryl)benzenes.

J Chem Phys 2019 Feb;150(6):064309

Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences, Universidad de Jaén, 23071 Jaén, Spain.

Electronic, optical, and semiconducting properties of a series of propeller-shaped oligo(styryl)benzenes have been systematically investigated to monitor the effect of the number of styryl branches (three, four, and six) around a central benzene core. In order to clarify the relationships between their structures and properties, Density Functional Theory calculations were carried out at several levels of theory considering solvents with different polarity. Absorption and vibrational Raman spectroscopies showed that cruciform, four-branched derivatives present the most effective π-conjugation in agreement with the lowest calculated bond length alternation and bandgap. Read More

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http://dx.doi.org/10.1063/1.5079935DOI Listing
February 2019

Differences in biochemical properties of two 5'-nucleotidases from deep- and shallow-sea Shewanella species under various harsh conditions.

Biosci Biotechnol Biochem 2019 Feb 14:1-9. Epub 2019 Feb 14.

a Graduate School of Biosphere Science , Hiroshima University , Higashi-Hiroshima , Japan.

Deep-sea Shewanella violacea 5'-nucleotidase (SVNTase) activity exhibited higher NaCl tolerance than that of a shallow-sea Shewanella amazonensis homologue (SANTase), the sequence identity between them being 70.4%. Here, SVNTase exhibited higher activity than SANTase with various inorganic salts, similar to the difference in their NaCl tolerance. Read More

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http://dx.doi.org/10.1080/09168451.2019.1578641DOI Listing
February 2019

Impact of Hydrogen Bonding on the Fluorescence of N-Amidinated Fluoroquinolones.

Chem Asian J 2019 Feb 14. Epub 2019 Feb 14.

UNITED STATES.

The fluorescence properties of AIE-active N-amidinated fluoroquinolones, efficiently obtained by a perfluoroaryl azide-aldehyde-amine reaction, have been studied. The fluorophores were discovered to elicit a highly sensitive fluorescence quenching response towards guest molecules with hydrogen-bond-donating ability. This effect was evaluated in a range of protic/aprotic solvents with different H-bonding capabilities, and also in aqueous media. Read More

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http://dx.doi.org/10.1002/asia.201801916DOI Listing
February 2019

Synthesis and Applications of Red-emissive Carbon Dots.

Chem Rec 2019 Feb 14. Epub 2019 Feb 14.

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry & Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.

Carbon dots (CDs), a new class of fluorescent carbon nanoparticles (less than 10 nm in size), have been widely applied in various fields, including sensors, bioimaging, catalysis, light-emitting devices (LEDs), and photoelectronic devices, owing to their unique properties such as low toxicity, bio-compatibility, high photostability, easy surface modification, and up-conversion fluorescence, over the past decades. Recently, multiple-color-emissive CDs, especially red-emissive CDs (RCDs), have drawn much attention owing to their unique advantages, like the ability to penetrate the animal bodies without the disturbance of strong tissue autofluorescence, multiple-color fluorescence displaying or sensing, and the capacity to be one essential component to obtain white LED (WLED). In this review, we focused on the progress of recently-emerging RCDs in the past five years, including their synthetic methods (hydrothermal, solvothermal, reflux condensation and microwave techniques), influencing factors (precursors, solvents, elements doping, surface chemistry) and various applications (bioimaging, sensor, photocatalysis and WLEDs), with a perspective on the future advancements. Read More

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http://doi.wiley.com/10.1002/tcr.201800172
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http://dx.doi.org/10.1002/tcr.201800172DOI Listing
February 2019
1 Read

Cluster nuclearity control and modulated hydrothermal synthesis of functionalized Zr metal-organic frameworks.

Dalton Trans 2019 Feb 14. Epub 2019 Feb 14.

Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117585 Singapore.

The synthesis of chemically stable metal-organic frameworks (MOFs) in benign solvents is a key step towards their scalable production and commercialization. Extending the modulated hydrothermal (MHT) synthesis approach for zirconium (Zr) MOFs, we herein demonstrate cluster nuclearity control over the secondary building units (SBUs) to target Zr6-based and Zr12-based phases for the Zr terephthalate (Zr-BDC) system. Different functional groups (-NH2, -NO2, -Br, -F4) can be incorporated into Zr12-BDC, providing an avenue to further tune the chemical properties of these promising MOFs. Read More

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http://dx.doi.org/10.1039/c8dt05060kDOI Listing
February 2019
4.197 Impact Factor

The application of the surface energy based solubility parameter theory for the rational design of polymer-functionalized MWCNTs.

Phys Chem Chem Phys 2019 Feb 14. Epub 2019 Feb 14.

Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK. and Williams Advanced Engineering, Grove, Oxfordshire, OX12 0DQ, UK.

The surface energy based solubility parameters theory was applied to model the degree of polystyrene-functionalisation of MWCNTs in six different organic solvents. The experimental characterization of the polymer-functionalized MWCNTs is consistent with the predictions of this model providing a breakthrough towards the rational design of functionalized MWCNTs based on thermodynamic parameters. Read More

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http://dx.doi.org/10.1039/c8cp07411aDOI Listing
February 2019

High-Resolution Mass Spectrometry Study of the Bio-Oil Samples Produced by Thermal Liquefaction of Microalgae in Different Solvents.

J Am Soc Mass Spectrom 2019 Feb 13. Epub 2019 Feb 13.

Skolkovo Institute of Science and Technology, Novaya St. 100, Skolkovo, Moscow, 143025, Russia.

We have performed a comparative analysis of the bio-oil produced by thermal liquefaction of microalgae in different solvents using high-resolution Orbitrap mass spectrometry and GC-MS approach. Water, methanol, ethanol, butanol, isopropanol, acetonitrile, toluene, and hexane were used as solvents in which the liquefaction was performed. It was observed that all resulting oils demonstrate a considerable degree of similarity. Read More

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http://dx.doi.org/10.1007/s13361-018-02128-9DOI Listing
February 2019
1 Read

A polyextremophilic alcohol dehydrogenase from the Atlantis II Deep Red Sea brine pool.

FEBS Open Bio 2019 Feb 18;9(2):194-205. Epub 2018 Dec 18.

KAUST Catalysis Center (KCC) King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia.

Enzymes originating from hostile environments offer exceptional stability under industrial conditions and are therefore highly in demand. Using single-cell genome data, we identified the alcohol dehydrogenase (ADH) gene, , from the Atlantis II Deep Red Sea brine pool. ADH/A1a is highly active at elevated temperatures and high salt concentrations (optima at 70 °C and 4 m KCl) and withstands organic solvents. Read More

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http://dx.doi.org/10.1002/2211-5463.12557DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6356862PMC
February 2019
1 Read

Synthesis of 4-Alkyl-4-1,2,4-triazole Derivatives by Suzuki Cross-coupling Reactions and Their Luminescence Properties.

Molecules 2019 Feb 12;24(3). Epub 2019 Feb 12.

Department of X-ray Crystallography and Crystal Chemistry, Institute of General and Ecological Chemistry, Lodz University of Technology, Żeromskiego 116, PL-90924 Łódź, Poland.

New derivatives of 4-alkyl-3,5-diaryl-4-1,2,4-triazole were synthesized utilizing the Suzuki cross-coupling reaction. The presented methodology comprises of the preparation of bromine-containing 4-alkyl-4-1,2,4-triazoles and their coupling with different commercially available boronic acids in the presence of ionic liquids or in conventional solvents. The obtained compounds were tested for their luminescence properties. Read More

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http://dx.doi.org/10.3390/molecules24030652DOI Listing
February 2019

Evaluating the Performance of Micro-Encapsulated CO Sorbents during CO Absorption and Regeneration Cycling.

Environ Sci Technol 2019 Feb 20. Epub 2019 Feb 20.

Lawrence Livermore National Laboratory , 7000 East Avenue , Livermore , California 94551 , United States.

We encapsulated six solvents with novel physical and chemical properties for CO sorption within gas-permeable polymer shells, creating Micro-Encapsulated CO Sorbents (MECS), to improve the CO absorption kinetics and handling of the solvents for postcombustion CO capture from flue gas. The solvents were sodium carbonate (NaCO) solution, uncatalyzed and with two different promoters, two ionic liquid (IL) solvents, and one CO-binding organic liquid (COBOL). We subjected each of the six MECS to multiple CO absorption and regeneration cycles and measured the working CO absorption capacity as a function of time to identify promising candidate MECS for large-scale carbon capture. Read More

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http://pubs.acs.org/doi/10.1021/acs.est.8b06442
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http://dx.doi.org/10.1021/acs.est.8b06442DOI Listing
February 2019
1 Read

Extraction of antidepressant drugs in biological samples using alkanol-based nano structured supramolecular solvent microextraction followed by gas chromatography-mass spectrometric analysis.

J Sep Sci 2019 Feb 13. Epub 2019 Feb 13.

Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, Tehran, Iran.

In the present study, a supramolecular solvent was formed from reverse micelle aggregates of octanol. The proposed supramolecular solvent was used for rapid extraction of some antidepressants drugs including amitriptyline, imipramine, desipramine, maprotiline, sertraline, and doxepin from biological samples. Alkanol-based supramolecular solvent have a unique array of physicochemical properties, making them a very attractive alternative to replace organic solvents in analytical extractions. Read More

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http://dx.doi.org/10.1002/jssc.201801152DOI Listing
February 2019

Ultrafast molecular sieving through functionalized graphene membranes.

Nanoscale 2019 Feb 13. Epub 2019 Feb 13.

Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.

Graphene shows great promise for advanced filtration membranes with high permeance and enhanced rejection. Here we demonstrate filtration membranes with a nanochannel network for superior separation performance using 100-500 nm-wide graphene nanoplatelets (GnPs) that are efficiently prepared via a green method. The resulting membranes exhibit a well packed layer structure formed by GnPs and are highly stable in water and organic solvents and even in strongly acidic and alkaline media. Read More

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http://dx.doi.org/10.1039/c9nr00356hDOI Listing
February 2019
1 Read

Methionine oxidation in α-synuclein inhibits its propensity for ordered secondary structure.

J Biol Chem 2019 Feb 12. Epub 2019 Feb 12.

University of Milano Bicocca.

α-Synuclein (AS) is an intrinsically disordered protein highly expressed in dopaminergic neurons. Its amyloid aggregates are the major component of Lewy bodies, a hallmark of Parkinson's disease (PD). AS is particularly exposed to oxidation of its methionine residues, both in vivo and in vitro. Read More

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http://dx.doi.org/10.1074/jbc.RA118.001907DOI Listing
February 2019
2 Reads

Multifunctional Copper(I) Coordination Polymers with Aromatic Mono- and Ditopic Thioamides.

Inorg Chem 2019 Feb 12. Epub 2019 Feb 12.

Instituto Madrileño de Estudios Avanzados en Nanociencia , Cantoblanco, Madrid 28049 , Spain.

Direct reactions under ambient conditions between CuX (X = Br, I) and thiobenzamide (TBA) were carried out at different ratios, giving rise to the formation of a series of one-dimensional (1D) coordination polymers, (CPs) [CuI(TBA)] (1), [CuI(TBA)] (4), and [CuBr(TBA)] (5), as well as two molecular complexes, [CuI(TBA)] (2) and [CuI(TBA)]·2MeCN (3). Recrystallization of 1 and 5 yielded a series of isostructural 1D CP solvated species, [CuI(TBA)·S] ] (1·S; S = tetrahydrofuran, acetone, methanol) and [CuBr(TBA)·S] (5·S; S = tetrahydrofuran, acetone), respectively. Similar reactions between CuI and 1,4-dithiobenzamide (DTBA) allowed the isolation of a series of two-dimensional (2D) CPs [CuI(DTBA)·S] (6·S; S = N, N-dimethylformamide, acetonitrile, methanol). Read More

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http://dx.doi.org/10.1021/acs.inorgchem.8b03364DOI Listing
February 2019
1 Read

Divergent Supramolecular Gelation of Backbone Modified Short Hybrid δ-Peptides.

Biomacromolecules 2019 Feb 20. Epub 2019 Feb 20.

Department of Chemistry , Indian Institute of Science Education and Research , Dr. Homi Bhabha Road , Pune - 411008 , India.

The ordered supramolecular assemblies of short peptides have been recently gaining momentum due to their widespread applications in biology and materials sciences. In contrast to the α-peptides, limited success has been achieved from the backbone modified peptides. The proteolytic stability and conformational flexibility of the backbone modified peptides composed of β-, γ-, and δ-amino acids can be explored to design ordered supramolecular gels and self-assembled materials. Read More

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http://pubs.acs.org/doi/10.1021/acs.biomac.8b01684
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http://dx.doi.org/10.1021/acs.biomac.8b01684DOI Listing
February 2019
1 Read

Balancing the Effect of Pretreatment Severity on Hemicellulose Extraction and Pulping Performance during Auto-Hydrolysis Prior to Kraft Pulping of Acacia Wood.

Biotechnol Prog 2019 Feb 12:e2784. Epub 2019 Feb 12.

Liaoning Key Laboratory of Pulp and Paper Engineering, Dalian Polytechnic University, Dalian 116034, China.

When using a combination of pre-extraction and chemical pulping, a high yield of sugar recovery and minimal negative effect on the subsequent pulping step are expected. In this work, the P factor was utilized to investigate the effect of auto-hydrolysis severity on sugar recovery, removal of the main component, and impact on the kraft pulping of acacia wood chips. Using a P factor of 235, 84. Read More

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http://dx.doi.org/10.1002/btpr.2784DOI Listing
February 2019
1 Read

Stable biphasic interfaces for open microfluidic platforms.

Biomed Microdevices 2019 Feb 12;21(1):16. Epub 2019 Feb 12.

Department of Chemistry, University of Washington, Seattle, WA, 98195, USA.

We present an open microfluidic platform that enables stable flow of an organic solvent over an aqueous solution. The device features apertures connecting a lower aqueous channel to an upper solvent compartment that is open to air, enabling easy removal of the solvent for analysis. We have previously shown that related open biphasic systems enable steroid hormone extraction from human cells in microscale culture and secondary metabolite extraction from microbial culture; here we build on our prior work by determining conditions under which the system can be used with extraction solvents of ranging polarities, a critical feature for applying this extraction platform to diverse classes of metabolites. Read More

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http://dx.doi.org/10.1007/s10544-019-0367-zDOI Listing
February 2019

Raman study of flash-lamp annealed aqueous CuZnSnS nanocrystals.

Beilstein J Nanotechnol 2019 17;10:222-227. Epub 2019 Jan 17.

Semiconductor Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany.

The effect of flash-lamp annealing (FLA) on the re-crystallization of thin films made of colloidal CuZnSnS nanocrystals (NCs) is investigated by Raman spectroscopy. Unlike similar previous studies of NCs synthesized at high temperatures in organic solvents, NCs in this work, which have diameters as small as 2-6 nm, were synthesized under environmentally friendly conditions in aqueous solution using small molecules as stabilizers. We establish the range of FLA conditions providing an efficient re-crystallization in the thin film of NCs, while preserving their kesterite structure and improving their crystallinity remarkably. Read More

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http://dx.doi.org/10.3762/bjnano.10.20DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6350886PMC
January 2019

Determination of quinalphos in human whole blood samples by high-performance thin-layer chromatography for forensic applications.

J Chromatogr A 2019 Feb 3. Epub 2019 Feb 3.

Department of Biochemistry, Gulbarga University, Kalaburagi, 585 106, Karnataka, India. Electronic address:

A simple and rapid procedure for the determination of quinalphos in human whole blood using liquid-liquid extraction and high-performance thin-layer chromatography was developed and validated. Seven different organic solvents were tested for optimum extraction of quinalphos from spiked blood samples. The effect of pH on the extraction yield of quinalphos was also examined. Read More

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http://dx.doi.org/10.1016/j.chroma.2019.02.003DOI Listing
February 2019

Melt-Processed Poly(Ether Ether Ketone)/Carbon Nanotubes/Montmorillonite Nanocomposites with Enhanced Mechanical and Thermomechanical Properties.

Materials (Basel) 2019 Feb 10;12(3). Epub 2019 Feb 10.

Key Laboratory of Materials Processing and Mold, Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, China.

The agglomeration problem of nanofillers, for instance, carbon nanotubes (CNTs) in a poly(ether ether ketone) (PEEK) matrix, is still a challenging assignment due to the intrinsic inert nature of PEEK to organic solvents. In this work, organically modified montmorillonite (MMT) was introduced as a second filler for improving the dispersion of CNTs in the PEEK matrix and enhancing the mechanical properties, as well as reducing the cost of the materials. The nanocomposites were fabricated through melt-mixing PEEK with CNTs/MMT hybrids, which were prepared in advance by mixing CNTs with MMT in water. Read More

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http://dx.doi.org/10.3390/ma12030525DOI Listing
February 2019

The β--Acetylhexosaminidase in the Synthesis of Bioactive Glycans: Protein and Reaction Engineering.

Molecules 2019 Feb 8;24(3). Epub 2019 Feb 8.

Laboratory of Biotransformation, Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, CZ-14220 Praha 4, Czech Republic.

-Acetylhexosamine oligosaccharides terminated with GalNAc act as selective ligands of galectin-3, a biomedically important human lectin. Their synthesis can be accomplished by β--acetylhexosaminidases (EC 3.2. Read More

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http://dx.doi.org/10.3390/molecules24030599DOI Listing
February 2019

Fabricating Paper Based Devices Using Correction Pens.

Sci Rep 2019 Feb 11;9(1):1752. Epub 2019 Feb 11.

School of Medical Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.

We present a rapid (<10 s), cost-effective, unique single-step method for fabricating paper-based devices without necessitating any expensive instrumentation, simply by deploying correction pens that are otherwise commonly used for masking typos in printed or written matters. The marked regions formed by deposits from the correction pen demonstrate ubiquitous flow resistances to typical aqueous solutions and organic solvents in the transverse direction, resulting in a preferential bulk flow along the axial direction of the paper channels 'fabricated' in the process. Considering the simplicity and cost-effectiveness of this platform, it is deemed to be ideal for (bio) chemical sensing and point-of-care diagnostics in resource-limited settings. Read More

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http://www.nature.com/articles/s41598-018-38308-6
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http://dx.doi.org/10.1038/s41598-018-38308-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6370803PMC
February 2019
2 Reads

Classical tosylate/chloride leaving group approach supports a tetrahedral transition state for additions to trigonal carbon.

Trends Org Chem 2018 ;19:1-11

Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115-2862, USA.

The experimentally measured rates of solvolysis of 2-chloroethoxycarbonyl chloride (2-chloroethyl chloroformate, , 2-chloroethoxycarbonyl -toluenesufonate , and phenoxycarbonyl -toluenesulfonate () were followed at 25.0 °C in various pure and binary aqueous-organic solvents with varying degrees of polarity. An analysis of the rate constants for , and , was carried out using the two-term extended Grunwald-Winstein equation and comparisons are made to the previously published results for ethyl and phenyl chloroformate esters. Read More

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6366630PMC
January 2018

Characterization of a novel thermostable carboxylesterase from thermoalkaliphilic bacterium Bacillus thermocloaceae.

Biosci Biotechnol Biochem 2019 Feb 10:1-10. Epub 2019 Feb 10.

a School of Earth Sciences and Environmental Engineering , Gwangju Institute of Science and Technology (GIST) , Gwangju , Republic of Korea.

A novel thermostable carboxylesterase (Est5250) of thermoalkaliphilic bacterium Bacillus thermocloaceae was heterologously expressed in Escherichia coli and its biochemical properties were investigated. Est5250 showed optimum esterase activity at 60 °C and pH 8.0. Read More

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http://dx.doi.org/10.1080/09168451.2019.1574555DOI Listing
February 2019
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Efficient Synthesis of Furfural from Biomass Using SnCl₄ as Catalyst in Ionic Liquid.

Molecules 2019 Feb 7;24(3). Epub 2019 Feb 7.

Tianjin Engineering Research Center of Biomass Solid Waste Resources Technology, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.

Furfural is a versatile platform molecule for the synthesis of various chemicals and fuels, and it can be produced by acid-catalyzed dehydration of xylose derived from renewable biomass resources. A series of metal salts and ionic liquids were investigated to obtain the best combination of catalyst and solvent for the conversion of xylose into furfural. A furfural yield of 71. Read More

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http://dx.doi.org/10.3390/molecules24030594DOI Listing
February 2019

Cyclopentyl-methyl ether (CPME): Versatile eco-friendly solvent for applications in Biotechnology and Biorefineries.

ChemSusChem 2019 Feb 8. Epub 2019 Feb 8.

Sustainable Momentum, SL. Av. Ansite 3, 4-6, Las Palmas Gran Canaria E-35011, Canary Islands, Spain. Tel. 00-34-609565237. E-mail: SPAIN.

The quest of sustainable solvents is currently matter of intense research and development, as solvents significantly contribute to the wastes generated by chemical industries. Cyclopentyl-methyl ether (CPME) is a promising eco-friendly solvent, because of its valuable properties such as low peroxide formation rate, stability at basic and acidic conditions, relatively high boiling point, etc. This review discusses the potential use of CPME for applications in Biotechnology (e. Read More

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http://dx.doi.org/10.1002/cssc.201900079DOI Listing
February 2019
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Aggregation Behavior of Model Asphaltenes Revealed from Large-Scale Coarse-Grained Molecular Simulations.

J Phys Chem B 2019 Feb 8. Epub 2019 Feb 8.

Fully atomistic simulations of models of asphaltenes in simple solvents have allowed the study of trends in aggregation phenomena and the understanding of the role that molecular structure plays therein. However, the detail included at this scale of molecular modeling is at odds with the required spatial and temporal resolution needed to fully understand the asphaltene aggregation. The computational cost required to explore the relevant scales can be reduced by employing coarse-grained (CG) models, which consist of lumping a few atoms into a single segment that is characterised by effective interac- tions. Read More

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http://pubs.acs.org/doi/10.1021/acs.jpcb.8b12295
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http://dx.doi.org/10.1021/acs.jpcb.8b12295DOI Listing
February 2019
3 Reads

Thermostable Branched-Chain Amino Acid Transaminases From the Archaea and : Biochemical and Structural Characterization.

Front Bioeng Biotechnol 2019 24;7. Epub 2019 Jan 24.

Henry Wellcome Building for Biocatalysis, Biosciences, University of Exeter, Exeter, United Kingdom.

Two new thermophilic branched chain amino acid transaminases have been identified within the genomes of different hyper-thermophilic archaea, , and . These enzymes belong to the class IV of transaminases as defined by their structural fold. The enzymes have been cloned and over-expressed in and the recombinant enzymes have been characterized both biochemically and structurally. Read More

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http://dx.doi.org/10.3389/fbioe.2019.00007DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6353796PMC
January 2019

Purification and characterization of alkaline protease with novel properties from strain S8.

J Genet Eng Biotechnol 2018 Dec 26;16(2):295-304. Epub 2018 May 26.

Department of Biochemistry, Andhra University, Visakhapatnam, India.

Proteases are the hydrolytic enzymes which hydrolyzes peptide bond between proteins with paramount applications in pharmaceutical and industrial sector. Therefore production of proteases with efficient characteristics of biotechnological interest from novel strain is significant. Hence, in this study, an alkaline serine protease produced by strain S8 (MTCC NO 11901) was purified and characterized. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S1687157X183005
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http://dx.doi.org/10.1016/j.jgeb.2018.05.009DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6354005PMC
December 2018
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Biginelli reaction on cellulose acetoacetate: a new approach for versatile cellulose derivatives.

Carbohydr Polym 2019 Apr 11;209:223-229. Epub 2019 Jan 11.

Key Lab of Science and Technology of Eco-textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, 201620, People's Republic of China; Key Lab of High Performance Fibers & Products, Ministry of Education, Donghua University, Shanghai, 201620, People's Republic of China; Innovation Center for Textile Science and Technology of DHU, Donghua University, Shanghai, 201620, People's Republic of China. Electronic address:

The Biginelli multicomponent reaction has been used as an effective and model method to efficiently prepare a library of cellulose derivatives based on cellulose acetoacetate (CAA). Various cellulose derivatives containing 3, 4-dihydropyrimidin-2(1 H)-ones (DHPMs) with different functional groups (carboxyl, methoxyl, and nitro) are synthesized. The entire reaction process is followed using FT-IR, H NMR. Read More

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http://dx.doi.org/10.1016/j.carbpol.2019.01.036DOI Listing
April 2019
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Molecular Insights into Water Clusters Formed in Tributylphosphate-Di-(2-ethylhexyl)phosphoric Acid Extractant Systems from Experiments and Molecular Dynamics Simulations.

J Phys Chem B 2019 Feb 7;123(7):1618-1635. Epub 2019 Feb 7.

Department of Chemical Engineering , Institute of Chemical Technology , Mumbai 400019 , India.

Di-(2-ethylhexyl)phosphoric acid (D2EHPA) and tributylphosphate (TBP) are two of the most studied and researched organophosphorous extractants. D2EHPA is an acidic extractant, offering both hydrogen bond donor and acceptor sites while TBP, a neutral extractant, only offers a single acceptor site per molecule. In spite of this, it is observed that 1 M D2EHPA in dodecane is a poorer extractant for water than 1 M TBP in dodecane. Read More

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http://dx.doi.org/10.1021/acs.jpcb.8b10831DOI Listing
February 2019

An improved 96 well plate format lipid quantification assay for standardisation of experiments with extracellular vesicles.

J Extracell Vesicles 2019 29;8(1):1565263. Epub 2019 Jan 29.

Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary.

The field of extracellular vesicles (EVs) is an exponentially growing segment of biomedical sciences. However, the problems of normalisation and quantification of EV samples have not been completely solved. Currently, EV samples are standardised on the basis of their protein content sometimes combined with determination of the particle number. Read More

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http://dx.doi.org/10.1080/20013078.2019.1565263DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6352952PMC
January 2019

Purification and catalytic behavior optimization of lactose degrading β-galactosidase from .

J Food Sci Technol 2019 Jan 13;56(1):167-176. Epub 2018 Nov 13.

5Department of Biochemistry, University of Karachi, Karachi, 75270 Pakistan.

The β-galactosidase is an industrially valuable enzyme and used to hydrolyze the lactose into glucose and galactose. Considering the broad utility profile in food industry, β-galactosidase from was purified and characterized in term of its catalytic properties and stability. It displayed highest catalytic efficiency at 60 °C after 10. Read More

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http://dx.doi.org/10.1007/s13197-018-3470-xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6342790PMC
January 2019

[Actinomyces with anti-candida activity isolated from leaf-cutting ants Atta cephalotes (Formicidae: Myrmicinae: Attini)].

Rev Peru Med Exp Salud Publica 2018 Oct-Dic;35(4):590-598

1 Laboratorio de Ecología Microbiana, Facultad de Ciencias Biológicas, Universidad Nacional Mayor de San Marcos, Lima, Perú.

Objectives.: To isolate, select and identify actinomyces associated to leaf-cutting ants Atta cephalotes (Linnaeus, 1758), that present a greater anti-Candida activity.

Materials And Methods. Read More

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http://dx.doi.org/10.17843/rpmesp.2018.354.3673DOI Listing

Ready-to-use green polyphenolic extracts from food by-products.

Food Chem 2019 Jun 18;283:628-636. Epub 2019 Jan 18.

Faculty of Food Technology and Biotechnology, University of Zagreb, Pierotijeva 6, 10000 Zagreb, Croatia.

To establish environmentally friendly polyphenolic extracts from grape and olive pomace, natural deep eutectic solvents (NADES) were used coupled with alternative energy sources - ultrasound and microwave irradiation. Obtained extracts were characterized by HPLC analysis, while antioxidant capacity was determined by ORAC method. Furthermore, in vitro cytotoxicity of prepared extracts was assessed by antiproliferation assay on two tumour cell lines, whereas for investigation of type of cell death or cell cycle arrest a flow cytometric analysis was applied. Read More

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http://dx.doi.org/10.1016/j.foodchem.2019.01.061DOI Listing
June 2019
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Environmentally benign and durable superhydrophobic coatings based on SiO nanoparticles and silanes.

J Colloid Interface Sci 2019 Jan 28;542:8-14. Epub 2019 Jan 28.

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, PR China; Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China. Electronic address:

The literatures about superhydrophobic coatings (SHCs) are increasing every year, however, undesirable chemicals including organic solvents and fluorinated compounds are intensively used in the existing preparation methods, which seriously hinder their large scale production and practical applications. Herein, a simple approach for preparation of totally waterborne, fluorine-free and durable SHCs is reported. First, a waterborne suspension of hexadecyl polysiloxane modified SiO (SiO@HD-POS) was prepared via HCl-catalyzed hydrolytic condensation of hexadecyltrimethoxysilane (HDTMS) and tetraethoxysilane with SiO nanoparticles. Read More

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http://dx.doi.org/10.1016/j.jcis.2019.01.115DOI Listing
January 2019
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Extended Mortality Follow-up of a Cohort of Dry Cleaners.

Epidemiology 2019 03;30(2):285-290

From the Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Rockville, MD.

Background: Dry cleaning workers are commonly exposed to tetrachloroethylene, a suspected bladder carcinogen, and other organic solvents. The health risks associated with solvent exposures in this industry are unclear.

Methods: We extended mortality follow-up of 5,369 dry cleaning union members in St. Read More

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http://dx.doi.org/10.1097/EDE.0000000000000951DOI Listing
March 2019
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Entropy/Enthalpy Compensation in Anion Binding: Biotin[6]uril and Biotin-l-sulfoxide[6]uril Reveal Strong Solvent Dependency.

J Org Chem 2019 Feb 19. Epub 2019 Feb 19.

Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 Copenhagen Ø , Denmark.

Binding of anions using macrocyclic structures with a nonpolar interior using the CH···anion interaction as the recognition motif has gained popularity in the past few years, and such receptors often rely on a subtle interplay between enthalpic and entropic factors. For these types of receptors solvation of both the anion and the binding pocket of the macrocyclic host play important roles in the overall energetic picture of the binding event. Systematic chemical modifications of synthetic receptors that are able to bind anions in a variety of solvents is an important tool to gain understanding of the factors that determine the supramolecular chemistry of anions. Read More

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http://dx.doi.org/10.1021/acs.joc.8b02797DOI Listing
February 2019

Postsynthetic Covalent and Coordination Functionalization of Rhodium(II)-Based Metal-Organic Polyhedra.

J Am Chem Soc 2019 Feb 20. Epub 2019 Feb 20.

Catalan Institute of Nanoscience and Nanotechnology (ICN2) , CSIC and The Barcelona Institute of Science and Technology , Campus UAB, Bellaterra, 08193 Barcelona , Spain.

Metal-organic polyhedra (MOP) are ultrasmall (typically 1-4 nm) porous coordination cages made from the self-assembly of metal ions and organic linkers and are amenable to the chemical functionalization of its periphery; however, it has been challenging to implement postsynthetic functionalization due to their chemical instability. Herein, we report the use of coordination chemistries and covalent chemistries to postsynthetically functionalize the external surface of ≈2.5 nm stable Rh(II)-based cuboctahedra through their Rh-Rh paddlewheel units or organic linkers, respectively. Read More

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http://pubs.acs.org/doi/10.1021/jacs.8b13593
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http://dx.doi.org/10.1021/jacs.8b13593DOI Listing
February 2019
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A series of two-dimensional lanthanide coordination polymers: synthesis, structures, magnetism and selective luminescence detection for heavy metal ions and toxic solvents.

Acta Crystallogr C Struct Chem 2019 Feb 31;75(Pt 2):221-230. Epub 2019 Jan 31.

College of Chemistry and Chemical Engineering, Taishan University, Taian 271000, Shandong Province, People's Republic of China.

A series of two-dimensional (2D) coordination polymers (CPs), namely poly[[bis(μ-acetato)diaqua(μ-biphenyl-3,3',5,5'-tetracarboxylato)bis(N,N-dimethylacetamide)digadolinium(III)] N,N-dimethylacetamide monosolvate], {[Gd(CHO)(CHO)(CHNO)(HO)]·CHNO} (CP1), poly[[bis(μ-acetato)diaqua(μ-biphenyl-3,3',5,5'-tetracarboxylato)bis(N,N-dimethylacetamide)didysprosium(III)] N,N-dimethylacetamide monosolvate], {[Dy(CHO)(CHO)(CHNO)(HO)]·CHNO} (CP2), poly[bis(μ-acetato)diaqua(μ-biphenyl-3,3',5,5'-tetracarboxylato)bis(N,N-dimethylacetamide)dineodymium(III)], [Nd(CHO)(CHO)(CHNO)(HO)] (CP3), poly[bis(μ-acetato)diaqua(μ-biphenyl-3,3',5,5'-tetracarboxylato)bis(N,N-dimethylacetamide)disamarium(III)], [Sm(CHO)(CHO)(CHNO)(HO)] (CP4), has been synthesized from rigid biphenyl-3,3',5,5'-tetracarboxylic acid under solvothermal conditions. Their structures have been determined by single-crystal X-ray diffraction analyses, elemental analyses, IR spectra, powder X-ray diffraction and thermogravimetric analyses, and CP1-CP4 crystallize in the monoclinic space group P2/n. CP1-CP4 are isomorphous and feature similar 2D double layers, which are further extended via interlayer hydrogen-bonding interactions into a three-dimensional (3D) supramolecular structure. Read More

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http://dx.doi.org/10.1107/S2053229618016972DOI Listing
February 2019
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